FIELD: electricity.
SUBSTANCE: invention relates to a normally closed power circuit breaker unit. Power circuit breaker unit has first and second arcing contact pieces (4, 5). Between arc-quenching contact parts (4, 5) there is a solution (6) contacts. Switch gas channel of circuit breaker unit joins contact gap (6) to surrounding area of circuit breaker unit for cooling a switch gas from contact gap (6). Several barriers (21a, 21b, 21c, 21d, 21e) that increase a flow resistance are arranged successively, spaced from one another, in switch gas channel. At least one of barriers (21a, 21b, 21c, 21d, 21e) is arranged between first pipe section (12), which is surrounded by second pipe section (14), and second pipe section (14).
EFFECT: efficient cooling of switch gas with a compact design.
7 cl, 1 dwg
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